CVE-2025-21590

criticalknown exploitedcovered by 1 sourcefirst seen 2025-03-13

Actively exploited. CVE-2025-21590 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2025-03-13) — exploitation has been observed in the wild, and US federal agencies are required to remediate it under BOD 22-01. Treat patching as urgent.

Juniper Junos OS contains an improper isolation or compartmentalization vulnerability. This vulnerability could allows a local attacker with high privileges to inject arbitrary code.

CSIRTS triage

What: This vulnerability allows a local attacker with high privileges to inject arbitrary code.
Who is affected: Local attackers with high privileges on Junos OS are affected.
Urgency: Remediation is urgent due to active exploitation and critical severity.
Action: Apply the latest security patches provided by Juniper.

AI-assisted analysis generated from the source advisory — verify against the original.

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Exploitation outlook

Exploitation confirmedAlready exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 74% of all EPSS-scored CVEs.

Advisory coverage (1)

criticalexploitedCVE-2025-21590: Juniper Junos OS Improper Isolation or Compartmentalization Vulnerabilitycisa-kev · 2025-03-13

External references

NVD record for CVE-2025-21590

CVE.org record

CISA KEV catalog

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